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Healthcare facilities are required to provide clean, safe environments.  To achieve this, the NHS ensures that any installed specialist building services meet the highest criteria.  Managing Director Andrew Robinson explains why Exi-tite is leading the way with sterile ventilation solutions in line with technical memorandum HTM-03. Exi-tite is a trusted advisor, designer and supplier of industry-leading ventilation products that provides sterile environments that comply with HTM-03 to specific applications such as healthcare, pharmaceutical, food manufacturing and ATEX. By handling all design, support and supply needs in-house, we maintain close relationships with consultants, installers and end users to ensure problem-free project delivery.


Using the healthcare technical memorandum HTM-03 as guidance, air handling unit (AHU) construction must meet strict criteria to prevent contamination. This includes smooth stainless steel internal panels and filter frames, low leakage dampers, copper or finless frost coils and access doors with two-stage openings.

Ventilation equipment construction is essential, and so too are correctly designed systems able to control the room’s air pressure, humidity levels and temperature.  Exi-tite is an HVAC specialist and, with extensive experience, has developed climate control methods that can utilise energy recovery without mixing supply and extract air, thereby maintaining sterile environments.

In partnership with leading German manufacturer Wolf, our bespoke modular systems can meet any specification and, in turn, any retrofit requirements, turning existing AHUs into sterile, highly-efficient systems with reduced downtime.

Belfast City Hospital

Exi-tite has supplied compliant ventilation solutions across a range of hospitals.  One such installation at Belfast City Hospital used two vertical modular AHUs manufactured in line with HTM-03 to provide 7200m3/h of supply and extract ventilation for two operating theatres.  Each system included energy-saving run-around coils, which remove energy from the extracted air and transfer it to the incoming fresh air supply, using a water circuit to maintain sanitisation levels.

Further installations have seen AHUs placed in a compound with a service corridor equipped with hand wash basins and hosepipe connections to maintain a sanitised environment while conducting AHU maintenance. Exi-tite’s internal design services help avoid additional costly and time-consuming processes, such as producing drawings in CAD and Revit.

Decentralised applications

Some buildings, particularly those of older construction, find that their ventilation needs to be improved in particular areas, possibly due to poor initial design or an area change of use. Retrofitting equipment that can provide ventilation in an energy-efficient manner can be costly or prove difficult.  To combat this, Exi-tite uses the Wolf CGL solution.  This energy recovery product is about the size of a small wardrobe and is capable of an airflow of 1.1m3/h. The unit is compact and designed to fit through a standard room door.  Ductwork can be installed in various configurations on the unit to serve a dedicated space and provide energy recovery and CO₂-regulated ventilation with a range of filtration options in a silent manner.

Exi-tite’s extensive HVAC experience and strong relationships with specialist manufacturers, consultants, installers, and end users mean we are perfectly placed to deliver your project to the highest standards.

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